Thread-controlling mechanism for sewing machines



w. M. HANNEMAN THREAD CONTROLLING MECHANISM FOR SEWING MACHINES Filed Dec. 14, 192? J a \l I 1 F v A rd 7. Air W i; v 1% IAMEWW? v f June '24, 1930.

CTL

Patented June 24, 1930 f wnnrnnmrneivnnmnn;or-oirrcneo; 1LLINors,. AssIenoR To Union SPECIAL -MA- 3 I i I cnmncomthmr,on cnrcneo, innrnorshconronn'rron or. IL INoIsi i f eneim a tem mechanism roRsEWme MAcH nEs u tm nt; frueiri e t'ixi s'er i4, i927; "Serial No. 240,005.

' The invention relates to "new; and useful pr m nts' h ad t w 11s m sh anism for sewlng mach nes,and"1nore particularly" to; a mechanism for clamping the threadatj predetermined tir'nes' 'o aidfin the proper'control thereot 1 It is a very common expedient-"in sewing machines .to provide nipperlsprings through which the .thradpasses froin'j the supply on the way to. an active thread controlling member, which nipper springs at predetermined timesrare closed by' means of a rotating cam,"

soth'at the thread is clamped and held so that ,theitakingiup of the thread by the controlling inechanismwill'be properly directed v 7 elementisfoften located close totheni-p'per springs; -The present invention'is directed particularly to a housing whichhouses' the to the stitch formingeleinents l l object of the "presen rnvention provide a housing for the .which 'co'n trols the nippersprings, which housing ip'r'e ventsthe 3 thread, if broken, from being wound on to 'thes shaft or nipper spring further provide a supporting bracket'for the nipper; springs, which also operates to hold the housing from rotating with th efshaft, -f. g

Theseand other objects will 1n part obvious and will in part be ,hereinafter more;

fully rdisclosed,

In the. drawings by way" of illustration 1 one ;embodiment of the inven g sewing machine showing the i invention-,- ap

' plied thereto;

, Fig. 2 is a sectional; view on the line 2-2 of Fig. 1;

parts of the shaft adjacent trolling cam, and r Fig. 4 is a perspective view-'ot fthe sn p,

porting bracket forthe nipperisprings.

It is-a common-expedient to provide va, ro-. v tatin g thread, controller" which engages the The invention is directed toa thread conthread between the supply-- and the stitch:-

, ing eleme nts for taking up the thread at certain times, andgiving -it up i at other tinies, so as to aid in the formation or the concatenated thread loops and the drawing ofthe loops to set thestitches; Associated with this rotating thread conrolling cam are nipper springs through which the, thread passes frorn'the supply to the controlling element A cam co-operates with these nipper springs and operates to close the springs 1 at predetermined intervals. This carn works in' tiining with the thread controlling member, so-that the nippersprings will be closed when the thread is drawn on by-the rotating controlling element, and thus the pull on the thread is directed to the portions there-,- of at the stitching point. This controlling portion of the shaft adjacent the rotating thread controllingelernent, and which also rotation,'and therefore, if the thread should break, the housing will prevent the thread from ,falling'on to either the rotating shaft. or, rotating cam, so that it will'be wound thereon. v I I I Referring more in detail to the drawings,

the invention is shown as applied to a sewing machine which includes a framed in which is mounted a main shaft 2 which is rotated V i I H I in any'suitabl'e way. Located onvthis main Figure ,1', is a plan-view oig a portio ota;

shaftQ is a rotating thread controlling cam 3f. This rotatingcain, as shown, is provided with a cylindrical projecting flange, the

ated with this rotating 702L111, are-thread guides& and 5; The thread uide 51 :16- cated withinwthe projecting flange of the thread controllingcarn 3,"while the thread guide 4 is located outside thereon These thread guides are carried bya support 6. The thread controlling "mechanism shown'in detail forms no part of the present invention, but isshown, described and claimed in the application of Charles F. Bubel', filed July 23,1927, seen N0. 207,9 3." The* thread as it is led from the supply, passes through suitable tensions, and then between thetwo nipper springs 7 and 8;" These nipfree edge of which is cameshaped Associ- I claim springs are rigidly attached to a sup-' r under i niP'Pe spr'ing 7 s, ai y means:

of a cam 12 at certain predetermined intervals, This Icam 12 liesdirectlybeneath the nipper springs and is mounted onthemain shaft 2. As the mainshaft 2 irotatesythe' cam will lift the lower 'nipper. spring "so as. to cause the thread to be-clamped. clamping of the thread is in proper timing with the active proje'ctingportions of jth'e; controlling cam, so that when the thread iszmlrawn upon-by the projecting portions, the

thread will be clamped, and instead of-pullingthr'ead from the supply, it will pullback 1 fon" the thread at the stitching point and properly take all slackjout of the thread; to aid in the formation of the concatenated loops, andto aid in; setting thestitches.

Mounted on the fshaftfi2' is a sleeve1'3 which oarriesa housing 14, This; housing 14j (seeQFig.2) includesa radially project if '30 ing disk porti'on 15,-and a laterallyprojecting flange; This housing is cutaway so-as to form a'recess 16. A pin 17 on the bracket 9 is adapted to engage a slot18: in'the hous-g ing 714, and this prevents the housing from rotating'on the main shaft 2. F The housingissupported on the shaft, but does not ro- 13 ate, The cam for operatingv the nipper springs works-through the recess 1'6. 'lhis,v

housing substantially encloses the cam'which operates the nipperr springs at theisid'es H thereofeand on the face of 'thejcamjadja-e cent the thread controlling cam. If. the; thread atany time should break, and the 1 end thereof djacent the i thread controlling 4 'cam,,orl'the'nipper springs d'rop,, do'wn it :will engage eitherrthe sle'eve 13 or the "hous f ing 14-, and t'hiswill prevent the thread frcm;

being wound on to the shaft or'o'n tothe I cam" whichoperatesthe'nipper s'pr1ngs'.

'IHGCIHLDISIH may beus'ed wlth various forms V 7 of stitch forming mechanism, but it is'par-i ticularlyadapted for use in connection with a loope r thread. V-It' is obvious also thatthe shaping of the thread-controlling may be greatly'varied without departing from I thespirit of the invention which is directed to the housing for the nipper opera-ting cam p i and the shaft adjacent the thread controlling .60 cam.

- Having was described the inventionewhat W trs'Patent, is' I V p 7 i 1. In a thread, controlling'mechanism,-

' '65 haft, thread clamping devicesga cam housing 1 being cut at thef i'iwe thereof It i is obvious, that the thread controlling;

asnew and-desireto secureby Let i mountedon said shaft and adaptedto operate said thread clamping vdevices, a 'stationary sleeve mounted ron theshaft, a house ingcarried by the sleeve and enclosing the sides'of saidcam, said housing-[being cut away so that saidcam mayproject'thrpugh p the housing and' operatesaidfthread {champing device's. I

2. 'Ina thread 7 controlling mechanism, the combinationgofg 'a,"shaft, trot'ating'ithread; :controllinglacam amounted 1 1on1: tthiei;z shaft, 7 I

clamping devices for the thread disposed" betweensaid' threadfentrelling cam and the thread supply, a rotating cam mounted on said shaft and aaaetee-eo operatethegclamping devices, and a stationary housingkadapted to enclosethel sides and ntheffa'c'eloflthe a ilei amp ng. devices." which 1' is adjacent, the "thread' eontrolli-ng cam said adja'cntthe cram ing devicesfso asitij'pe'r i mit: the cam to,engage' and "operate :said devices.

' 3. Ina thread;controlling methanisin, I

combination a shaft, [a rotating ftlireadf controlling camjmountedon the jshaftiiiip-g V per springs for clampin'g-the,threfatlpassing.

from the supply fto' thefthread controlling earn, a team on said shaft fad'apted: to'jclose" the p r s ring's, asleeve on the shaft, a

housing carried by'the sleeve and-enclosing the sides of'thefcam'opera'ting 'th-e ni'pper" springs and theface thereof adjacent; the thread controlling 'cam, saitl housingbeing I cut away "at the face heta-0r adjacent i nipper springs; so that the cam 'forft he' nipper springs'may project through-'andeii g Said Springs, and meansfor preventing saidsleeve and housing from rotating U p the shaft. 7 e

'4. Inathreadfcontrolling meelianisim the" combination of a shaft, arotatiirg thread controlling cam 'niountedon the sh'a'ft, l o

threadguidin'g device's associated {withsaid cam, a support for said devlcesfa'brac'ket 'on which said su -part is inou'ntedfnipper springs 'mounted on' saidfbraket, a

mounted on'the shaft and adapted to"c1lose; said nippe'r springs,- a sleeve mounted can-1e shaft, a housing carried {by the sleeveand enclosing the sides and the face o 'f 't'he cam operating the nipper spr-ingewhich stdjacent the thread controlling cam, said i'housi ing being cut away -adj-acent;: the 'ni'pper springs topermit the camto' project through and engage the nipper 'sp'ring s, and' a pln carried by the bracket. and adapteditoen gage a slot'inth'e housing for'holding -the housing a-nd sleeve from rotating-with the Y Shaft. 7 I 3 V 7 ;In' testimony whereof; I e y fi f 

